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609 results on '"Hamano H"'

1. Differential cross sections and photon beam asymmetries of $\eta$ photoproduction on the proton at $E_\gamma$ = 1.3-2.4 GeV

Author

Hashimoto, T., Nam, T., Muramatsu, N., Ahn, J. K., Chang, W. C., Chen, J. Y., Chu, M. L., Date, S., Gogami, T., Goto, H., Hamano, H., He, Q. H., Hicks, K., Hiraiwa, T., Honda, Y., Hotta, T., Ikuno, H., Inoue, Y., Ishikawa, T., Jaegle, I., Jo, J. M., Kasamatsu, Y., Katsuragawa, H., Kido, S., Kon, Y., Matsumoto, S., Matsumura, Y., Miyabe, M., Mizutani, K., Nakamura, T., Nakano, T., Niiyama, M., Nozawa, Y., Ohashi, Y., Ohnishi, H., Ohta, T., Ozawa, K., Rangacharyulu, C., Ryu, S. Y., Sada, Y., Shibukawa, T., Shimizu, H., Shirai, R., Shiraishi, K., Strokovsky, E. A., Sugaya, Y., Sumihama, M., Suzuki, S., Tanaka, S., Taniguchi, Y., Tokiyasu, A., Tomida, N., Tsuchikawa, Y., Ueda, T., Yamazaki, H., Yamazaki, R., Yanai, Y., Yorita, T., Yoshida, C., and Yosoi, M.

Subjects
Nuclear Experiment
Abstract

We have carried out exclusive measurements for the photoproduction of an $\eta$ meson from a proton target with an egg-shaped calorimeter made of BGO crystals (BGOegg) and forward charged-particle detectors at the SPring-8 LEPS2 beamline. The differential cross sections and photon beam asymmetries of the $\gamma p \to \eta p$ reaction are measured in a center-of-mass energy ($W$) range of $1.82$-$2.32$ GeV and a polar angle range of $-1.0 < \cos{\theta^{\eta}_{\mathrm{c.m.}}} < 0.6$. The reaction is identified by selecting a proton and two $\gamma$'s produced by an $\eta$-meson decay. The kinematic fit method was employed to select the reaction candidate with the confidence level larger than $1$\%. A bump structure at $W$ = $2.0$-$2.3$ GeV in the differential cross section is confirmed at extremely backward $\eta$ polar angles, where the existing data are inconsistent with each other. This bump structure is likely associated with high-spin resonances that couple with $s\bar{s}$ quarks. The results of the photon beam asymmetries in a wide $\eta$ polar angle range are new for the photon beam energies exceeding $2.1$ GeV. These results are not reproduced by the existing partial wave analyses. They provide an additional constraint to nucleon resonance studies at high energies., Comment: 16 pages, 11 figures

Published
2022
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2. SPring-8 LEPS2 beamline: A facility to produce a multi-GeV photon beam via laser Compton scattering

Author

Muramatsu, N., Yosoi, M., Yorita, T., Ohashi, Y., Ahn, J. K., Ajimura, S., Asano, Y., Chang, W. C., Chen, J. Y., Date, S., Gogami, T., Hamano, H., Hashimoto, T., Hiraiwa, T., Hotta, T., Ishikawa, T., Kasamatsu, Y., Katsuragawa, H., Kobayakawa, R., Kohri, H., Masumoto, S., Matsumura, Y., Miyabe, M., Mizutani, K., Morino, Y., Nakano, T., Nam, T., Niiyama, M., Nozawa, Y., Ohkuma, H., Ohnishi, H., Ohta, T., Oishi, M., Ozawa, K., Ryu, S. Y., Sada, Y., Saito, H., Shibukawa, T., Shimizu, H., Shirai, R., Shoji, M., Sumihama, M., Suzuki, S., Tanaka, S., Taniuchi, Y., Tokiyasu, A. O., Tomida, N., Tsuchikawa, Y., Watanabe, K., Yoon, C. J., and Yoshida, C.

Subjects
Physics - Accelerator Physics, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

We have constructed a new laser-Compton-scattering facility, called the LEPS2 beamline, at the 8-GeV electron storage ring, SPring-8. This facility provides a linearly polarized photon beam in a tagged energy range of 1.3--2.4 GeV. Thanks to a small divergence of the low-emittance storage-ring electrons, the tagged photon beam has a size (sigma) suppressed to about 4 mm even after it travels about 130 m to the experimental building that is independent of the storage ring building and contains large detector systems. This beamline is designed to achieve a photon beam intensity higher than that of the first laser-Compton-scattering beamline at SPring-8 by adopting the simultaneous injection of up to four high-power laser beams and increasing a transmittance for the long photon-beam path up to about 77%. The new beamline is under operation for hadron photoproduction experiments.

Published
2021
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3. Search for $\eta'$ bound nuclei in the $^{12}{\rm C}(\gamma,p)$ reaction with simultaneous detection of decay products

Author

Tomida, N., Muramatsu, N., Niiyama, M., Ahn, J. K., Chang, W. C., Chen, J. Y., Chu, M. L., Daté, S., Gogami, T., Goto, H., Hamano, H., Hashimoto, T., He, Q. H., Hicks, K., Hiraiwa, T., Honda, Y., Hotta, T., Ikuno, H., Inoue, Y., Ishikawa, T., Jaegle, I., Jo, J. M., Kasamatsu, Y., Katsuragawa, H., Kido, S., Kon, Y., Maruyama, T., Masumoto, S., Matsumura, Y., Miyabe, M., Mizutani, K., Nagahiro, H., Nakamura, T., Nakano, T., Nam, T., Ngan, T. N. T., Nozawa, Y., Ohashi, Y., Ohnishi, H., Ohta, T., Ozawa, K., Rangacharyulu, C., Ryu, S. Y., Sada, Y., Sasagawa, M., Shibukawa, T., Shimizu, H., Shirai, R., Shiraishi, K., Strokovsky, E. A., Sugaya, Y., Sumihama, M., Suzuki, S., Tanaka, S., Tokiyasu, A., Tsuchikawa, Y., Ueda, T., Yamazaki, H., Yamazaki, R., Yanai, Y., Yorita, T., Yoshida, C., and Yosoi, M.

Subjects
Nuclear Experiment
Abstract

We measured missing mass spectrum of the $^{12}{\rm C}(\gamma,p)$ reaction for the first time in coincidence with potential decay products from $\eta'$ bound nuclei. We tagged an ($\eta+p$) pair associated with the $\eta'N\to\eta N$ process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle $\cos\theta^{\eta p}_{lab}<-0.9$ was obtained to be 2.2 nb/sr at the 90$\%$ confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree $\eta'$ production rate. Our results indicate a small branching fraction of the $\eta'N\to\eta N$ process and/or a shallow $\eta'$-nucleus potential., Comment: 7 pages, 4 figures

Published
2020
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4. SPring-8 LEPS2 beamline: A facility to produce a multi-GeV photon beam via laser Compton scattering

Author

Muramatsu, N., Yosoi, M., Yorita, T., Ohashi, Y., Ahn, J.K., Ajimura, S., Asano, Y., Chang, W.C., Chen, J.Y., Daté, S., Gogami, T., Hamano, H., Hashimoto, T., Hiraiwa, T., Hotta, T., Ishikawa, T., Kasamatsu, Y., Katsuragawa, H., Kobayakawa, R., Kohri, H., Masumoto, S., Matsumura, Y., Miyabe, M., Mizutani, K., Morino, Y., Nakano, T., Nam, T., Niiyama, M., Nozawa, Y., Ohkuma, H., Ohnishi, H., Ohta, T., Oishi, M., Ozawa, K., Ryu, S.Y., Sada, Y., Saito, H., Shibukawa, T., Shimizu, H., Shirai, R., Shoji, M., Sumihama, M., Suzuki, S., Tanaka, S., Taniuchi, Y., Tokiyasu, A.O., Tomida, N., Tsuchikawa, Y., Watanabe, K., Yoon, C.J., and Yoshida, C.

Published
2022
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5. $\phi$ photoproduction on the proton at $E_{\gamma}$ = 1.5 - 2.9 GeV

Author

Mizutani, K., Niiyama, M., Nakano, T., Yosoi, M., Nozawa, Y., Ahn, D. S., Ahn, J. K., Chang, W. C., Chen, J. Y., Daté, S., Gohn, W., Hamano, H., Hashimoto, T., Hicks, K., Hiraiwa, T., Hotta, T., Hwang, S. H., Ishikawa, T., Joo, K., Jung, W. S., Kato, Y., Katsuragawa, H., Kim, M. H., Kim, S. H., Kohri, H., Kon, Y., Lee, H. S., Maeda, Y., Matsumura, Y., Mibe, T., Miyabe, M., Morino, Y., Muramatsu, N., Nakatsugawa, Y., Noumi, H., Ohashi, Y., Ohta, T., Oka, M., Park, J. B., Parker, J. D., Rangacharyulu, C., Ryu, S. Y., Sada, Y., Sawada, T., Shibukawa, T., Shiu, S. H., Sugaya, Y., Sumihama, M., Tanaka, S., Tokiyasu, A. O., Tomida, N., Tran, H. N., Tsunemi, T., Uchida, M., Ungaro, M., and Yanai, Y.

Subjects
Nuclear Experiment
Abstract

Differential cross sections at $t=t_{\text{min}}$ and decay asymmetries for the $\gamma p\rightarrow\phi p$ reaction have been measured using linearly polarized photons in the range 1.5 to 2.9 GeV. These cross sections were used to determine the Pomeron strength factor. The cross sections and decay asymmetries are consistently described by the $t$-channel Pomeron and pseudoscalar exchange model in the $E_{\gamma}$ region above 2.37 GeV. In the lower energy region, an excess over the model prediction is observed in the energy dependence of the differential cross sections at $t=t_{\text{min}}$. This observation suggests that additional processes or interference effects between Pomeron exchange and other processes appear near the threshold region., Comment: 6 pages, 7 figures

Published
2017
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6. A fast profile monitor with scintillating fiber hodoscopes for high-intensity photon beams

Author

Ishikawa, T., Fujimura, H., Hamano, H., Hashimoto, R., Honda, Y., Ishida, T., Kaida, S., Kanda, H., Kido, S., Matsumura, Y., Miyabe, M., Mizutani, K., Nagasawa, I., Nakamura, A., Nanbu, K., Nawa, K., Ogushi, S., Shibasaki, Y., Shimizu, H., Sugai, H., Suzuki, K., Takahashi, K., Takahashi, S., Taniguchi, Y., Tokiyasu, A.O., Tsuchikawa, Y., and Yamazaki, H.

Published
2016
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10. Standard steroid treatment for autoimmune pancreatitis

Author

Kamisawa, T., Shimosegawa, T., Okazaki, K., Nishino, T., Watanabe, H., Kanno, A., Okumura, F., Nishikawa, T., Kobayashi, K., Ichiya, T., Takatori, H., Yamakita, K., Kubota, K., Hamano, H., Okamura, K., Hirano, K., Ito, T., Ko, S.B.H., and Omata, M.

Subjects
Pancreatitis -- Care and treatment, Pancreatitis -- Patient outcomes, Pancreatitis -- Research, Steroids (Drugs) -- Dosage and administration, Steroids (Drugs) -- Research, Health
Published
2009

18. Estimation of CO2 sequestration potential by afforestation in the arid rangelands of Western Australia based on long-term empirical data

Author

Suganuma, H., Aikawa, S-I, Sakai, Y., Hamano, H., Takahashi, N., Tahara, K., Kawarasaki, S., Utsugi, H., Egashira, Y., Kawanishi, T., Harper, R.J., Tanouchi, H., Kojima, T., Abe, Y., Saito, M., Kato, S., Law, J., Yamada, K., Suganuma, H., Aikawa, S-I, Sakai, Y., Hamano, H., Takahashi, N., Tahara, K., Kawarasaki, S., Utsugi, H., Egashira, Y., Kawanishi, T., Harper, R.J., Tanouchi, H., Kojima, T., Abe, Y., Saito, M., Kato, S., Law, J., and Yamada, K.

Abstract

Large-scale afforestation is a key measure to mitigate global warming, however, implementation may result in land-use competition with agriculture. To avoid such competition, carbon mitigation methods using arid and semi-arid areas have been proposed, but to our knowledge there is no report of rates of sequestration based on long-term observations from actual experimentation. In this study (1999–2015), in an arid area near Leonora, Western Australia (annual rainfall: 220 mm year−1; pan evaporation: 3400 mm year−1), carbon sequestration was assessed in above and below ground biomass in Eucalyptus camaldulensis under ambient conditions and with active site amelioration (combination of water harvesting with large mounds and hardpan blasting). The carbon sequestration rate was estimated at 7.92 Mg-CO2-e ha−1 year−1 for a total carbon sink of 230 Mg-CO2-e ha−1. Carbon mitigation may thus be a viable option in arid regions, not only in Western Australia but globally, and can be enhanced with active site engineering.

Published
2019

26. Relationship between the administration of nicardipine hydrochloride and the development of delirium in patients on mechanical ventilation

Author

Zamami, Y., Kouno, Y., Niimura, T., Chuma, M., Imai, T., Mitsui, M., Koyama, T., Kayano, M., Okada, N., Hamano, H., Goda, M., Imanishi, M., Takechi, K., Horinouchi, Y., Kondo, Y., Yanagawa, H., Kitamura, Y., Sendo, T., Ujike, Y., and Ishizawa, K.

Abstract

A history of hypertension is a known risk factor for delirium in patients in intensive care units, but the effect of antihypertensive agents on delirium development is unclear. Nicardipine, a calcium channel blocker, is widely used in ICU as a treatment agent for hypertensive emergency. This study investigated the relationship between the administration of nicardipine hydrochloride and delirium development in patients under mechanical ventilation. We conducted a medical chart review of 103 patients, who were divided into two groups according to the use of nicardipine hydrochloride. The prevalence of delirium was compared with respect to factors such as age, sex, laboratory data, and medical history, by multivariate analysis. 21 patients (20.4 %) were treated with nicardipine hydrochloride in 103 patients. The treatment and non-treatment groups differed significantly in age (72 vs. 65 years) and history of high blood pressure (57% vs. 11%). Multivariate analysis revealed that patients in the treatment group developed delirium significantly less often than those in the non-treatment group (19% vs. 48%). These results suggested that treatment of high blood pressure with nicardipine hydrochloride is a possible method for preventing the development of delirium.

Published
2018
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30. Autoimmune arthritis deteriorates bone quantity and quality of periarticular bone in a mouse model of rheumatoid arthritis.

Author

Endo, K., Shimizu, T., Takahata, M., Kameda, Y., Hamano, H., Hiratsuka, S., Ota, M., Sato, D., Iwasaki, N., Kimura-Suda, H., Ito, T., Todoh, M., and Tadano, S.

Subjects
FEMUR radiography, RISK factors of fractures, ANIMAL experimentation, BONE resorption, COMPUTED tomography, HISTOLOGY, INFRARED spectroscopy, MICE, RHEUMATOID arthritis, TIBIA, DISEASE complications
Abstract

Summary: This study showed that autoimmune arthritis induces especially severe osteoporosis in the periarticular region adjacent to inflamed joints, suggesting that arthritis increases the fragility fracture risk near inflamed joints, which is frequently observed in patients with RA. Introduction: Periarticular osteoporosis near inflamed joints is a hallmark of early rheumatoid arthritis (RA). Here we show that rheumatic inflammation deteriorates the bone quality and bone quantity of periarticular bone, thereby decreasing bone strength and toughness in a mouse model of RA. Methods: Female BALB/c mice and SKG mice, a mutant mouse model of autoimmune arthritis on the BALB/c background, were used. At 12 weeks of age, BALB/c mice underwent either Sham surgery or bilateral ovariectomy (OVX), and SKG mice underwent intraperitoneal injection of mannan to induce arthritis. Eight weeks later, the mice were killed and the femurs and tibias were subjected to micro-computed tomography, Fourier transform infrared (FTIR) spectroscopic imaging, X-ray diffraction, histology, and mechanical testing. Results: SKG mice developed significant trabecular bone loss in both the distal metaphysis of the femur and the lumbar vertebral body, but the extent of the bone loss was more severe in the distal metaphysis. Neither SKG nor OVX mice exhibited changes in the geometry and matrix properties of the diaphysis of the femur, whereas SKG mice, but not OVX mice, did exhibit changes in these properties in the distal metaphysis of the femur. Bone strength and fracture toughness of the distal metaphysis of the tibia adjacent to the inflamed ankle joint were significantly decreased in SKG mice. Conclusions: Autoimmune arthritis induces periarticular osteoporosis, characterized by deterioration of cortical bone geometry and quality as well as by trabecular bone loss, leading to severe bone fragility in periarticular bone adjacent to inflamed joints. [ABSTRACT FROM AUTHOR]

Published
2017
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31. Time-of-Propagation Counter for the LEPS

Author

Yoon, C. J., primary, Oka, M., additional, Ryu, S. Y., additional, Yosoi, M., additional, Matsuoka, K., additional, Kato, Y., additional, Arita, Y., additional, Inami, K., additional, Suzuki, K., additional, Hyakawa, T., additional, Iijima, T., additional, Hamano, H., additional, Maeshima, R., additional, Hirose, S., additional, Horii, Y., additional, Niiyama, M., additional, Nozawa, Y., additional, Muramatsu, N., additional, Strokovsky, E. A., additional, Uchida, M., additional, Barrett, M., additional, Browder, T., additional, Hotta, T., additional, Jones, M., additional, Korpar, S., additional, Kasamatsu, Y., additional, Morino, Y., additional, Nakatsugawa, Y., additional, Nakano, T., additional, Nam, T., additional, and Noumi, H., additional

Published
2014
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32. Long-term changes in precipitation characteristics at Sturt Meadows, Western Australia

Author

Kurosawa, K., Suganuma, H., Aikawa, S., Kawarasaki, S., Hamano, H., Utsugi, H., Abe, Y., Kojima, T., Harper, R., Luff, J., Stock, W., Lund, M., Bannister, M., Kurosawa, K., Suganuma, H., Aikawa, S., Kawarasaki, S., Hamano, H., Utsugi, H., Abe, Y., Kojima, T., Harper, R., Luff, J., Stock, W., Lund, M., and Bannister, M.

Abstract

Long-term changes in the precipitation data at Sturt Meadows were analyzed by the Mann-Kendall statistics and the Lepage test. Yearly and spring precipitation increased significantly from 1910 to 2008, and the significance levels were p < 0.10 and 0.01, respectively. The data of daily precipitation were classified into two groups (class 1-4 and 5) separated by the distribution of the data, and class 1-4 precipitation increased significantly. There were 4 significant-climatic jumps (1925-27, 1963, 1979-1982 and 1993) by results of the Lepage test. The averages of yearly precipitation during whole years and the latest period are 215.0 and 280.9 mm/year, respectively. The averages of monthly precipitation in February, October and November during the latest period (1993-2008) is higher than those in the previous periods. That in February during the latest period was especially heavy, when the mean precipitation in February was six times higher than that in the previous period. This change was attributed to the increase in the frequency of storm events in February during the latest period. Monthly precipitation exceeding 100 mm/month in February was recorded three times (1995, 2001 and 2006), and this occurred only 2 times in previous periods (1925 and 1975).

Published
2010

33. Improvement effect of semi-arid land afforestation on soil environment

Author

Kojima, T., Inaba, K., Koyanagi, S., Suganuma, H., Kurosawa, K., Kawarasaki, S., Tanouchi, H., Harper, R., Yamada, K., Hamano, H., Kojima, T., Inaba, K., Koyanagi, S., Suganuma, H., Kurosawa, K., Kawarasaki, S., Tanouchi, H., Harper, R., Yamada, K., and Hamano, H.

Abstract

Carbon fixation by afforestation in semi-arid land has been proposed as one of the most promising countermeasures against the global warming issue. Our demonstration area for carbon fixation suffered some serious problems, such as salinization and water logging, which we attempted to solve. We tried to reduce the groundwater level by taking advantage of the transpiration of planted trees. The two sites used were identified as D-low and D-high. In this study, the transpiration of planted trees, soil water change, and groundwater level were measured. E. sargentii and E. occidentalis were considered to be optimum. From the analyses of the groundwater and soil water contents, water was found to gather at the D-low site. However, analysis of the Neutron Moisture Meter (NMM) data indicated that the volumetric water content did not rise. Through the transpiration of planted trees, groundwater was absorbed via tree roots located in deep soil. Thus, the groundwater level was expected to decrease, but this decrease was prevented by the collected water. On the other hand, due to afforestation at the D-high site, where it was difficult for water to gather, a decreasing tendency in the amount of groundwater was clearly shown by the volumetric water content. Furthermore, the precipitation water trickled down through the soil surface layer, which was expected to mitigate the salt accumulation in topsoil. Soil improvement effects by afforestation, i.e., desalination and the prevention of water logging through the transpiration of planted trees, were confirmed in our research area.

Published
2009

35. Clinical features of a new disease concept, IgG4-related thyroiditis

Author

Watanabe, T, primary, Maruyama, M, additional, Ito, T, additional, Fujinaga, Y, additional, Ozaki, Y, additional, Kodama, R, additional, Muraki, T, additional, Hamano, H, additional, Arakura, N, additional, Kadoya, M, additional, Suzuki, S, additional, Komatsu, M, additional, Shimojo, H, additional, Notohara, K, additional, Uchida, M, additional, and Kawa, S, additional

Published
2013
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